OSCmessages sent -> and received <- by the python wrapper

  -> "/play" : ask puredata to play all tracks
  -> "/pause" : ask puredata to pause all tracks
  -> "/sampler" : warn puredata to get into multitrack mode
  -> "/load" : ask puredata to load files
              -(int) trackNumber (between 0 and 12)
              -(string) file path (full absolute path, eg : /home/myUser/myFolder/audio/myfile.wav)
  -> /volume : set the volume on a specific track (including one-shot sample tracks)
              -(int) trackNumber (between 0 and 12)
              -(int) volume (between 0 and 1000)
  -> /playSample : play the one-shot sample from the specified track
                -(int) trackNumber (between 0 and 12, currently tracks 2,5,8,11 contains samples)
                -(int) volume (between 0 and 1000)
  -> /synth : this message tells puredata to switch to synth mode (loading an appropriate patch). It can be anything defined l48
  -> /calibrateAmbiant : ask the D1 to calibrate current illumination as ambiant light on all sensors
  -> /calibrateMax : ask the D1 to calibrate current illumination as maximum light on all sensors
  -> /ledON : ask the D1 to light it's onboard LED, used here as a talent light (on when the sensor is active, off otherwise)
  -> /ledOFF : ask the D1 to switch it's onboard LED off

  <- /myID : allow the wrapper to discover new devices
            -(string) hostname : unique name of the D1 which include it's MAC address
            -(string) IP : it's current IP (allocated by DCHP on the Pi)
            -(int) sensorCount : the number of inputs currently used on this particular Wemos

  <- /A (can also be /B... to /D or anything else defined l64 in OLOwrapper.py and l27 in MCP3208.ino)
        : contain the values sent from the D1 to the rPi, calibrated and normalised between 0~1000
        -(int) data : value in the 0~1000 range. They can be as many datas as needed, declared l64 in OLOwrapper.py and l66 in MCP3208.ino